Charles Albert Sterling Silver Agate Slice Ring Adjustable from 6.5 to 8.5Material: Genuine Fine Sterling Silver (. 95 silver, 95% silver content) Stone(s): 1 genuine agate Ring Face Dimension: 1. 75 x 1. 0 x 0. 25 inches Weight: 24. 4 grams Ring Size (US): Adjustable from 6. 5 to 8. 5 Stamp Mark: Charles Albert, Fine Sterling Silver Serial Number: r29257 Agate is a striped chalcedony quartz that forms in layers and in a wide variety of colors and textures. An individual agate forms by filling a cavity in a "host" rock. As